diff --git a/tox.ini b/tox.ini
index 682a955b8..a3e26ddb6 100644
--- a/tox.ini
+++ b/tox.ini
@@ -40,7 +40,7 @@ commands = sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasen
 
 [testenv:docs]
 deps = -r{toxinidir}/doc/requirements.txt
-commands = python setup.py build_sphinx
+commands = sphinx-build -W -b html doc/source doc/build/html
 setenv = PYTHONHASHSEED=0
 
 [testenv:venv]